Apparatus for handling fine bulk material

ABSTRACT

An apparatus for handling a fine bulk material including a tubular member formed of a gas permeable material, a tubular member formed of a gas impermeable material encompassing the first mentioned tubular member, having an inlet and outlet at opposite ends thereof, a helical member mounted on the first mentioned tubular member, means for rotating the first mentioned tubular member and means for injecting a fluid under pressure through the first mentioned tubular member into the annular passageway disposed between such tubular members including the helical member, precluding the settling of material being conveyed in such passageway.

This invention relates to an apparatus for handling fine bulk material and more particularly to an apparatus for conveying such material by means of an auger shaft at a steady and even flow rate.

BACKGROUND OF THE INVENTION

In the use of an auger in conveying fine bulk materials, it has been found that such usage results in an unsteady and uneven flow of materials, and even stoppage due to clogging. Such effects have been found to be caused by the accumulation and settlement of fine material particles in the spacing between helical flights which diminishes and possibly blocks the flow of material through the conveyance device. The result of such accumulation and settlement of material particles is a loss of capacity due to material accumulation diminishing the space between helical flights, and a reduction in the uniformity of the material being conveyed due to the detachment and discharge of segments of material lodged in helical flights. The deeper the spacing between helical flights, the greater the accumulation and settlement of material sought to be conveyed.

Accumulation of powdered material between helical flights reduces the cubic feet per revolution capacity of an auger shaft and thus requires operating the feed mechanism at higher rotational speeds to attain the same feed rate when there is no such blockage. Accordingly, it is the principal object of the present invention to provide an apparatus for receiving, conveying and discharging a fine bulk material, utilizing a helical shaft for impelling such material in a continuous and uniform flow pattern.

SUMMARY OF THE INVENTION

The principal object of the present invention is achieved by an apparatus generally including a support; a first tubular conduit formed of a gas impermeable material journalled in such support, having one closed end providing an axially disposed passageway with at least one radial outlet; a second tubular conduit formed of a gas permeable material encompassing and spaced from such first tubular conduit, having closed ends, providing a first annular passageway communicating with the radial outlet of said first tubular conduit's axially disposed passageway; a third tubular conduit formed of a gas impermeable material mounted on such support, encompassing and spaced from such second tubular conduit, providing a second annular passageway closed at one end thereof, opened at a spaced end thereof and provided with an inlet at such one end thereof; a helical member mounted coaxially on such second tubular member, in such second annular passageway, between the closed and spaced outlet thereof; means for injecting a fluid under pressure into the first passageway and the radial passageway between the first and second annular passageways; and means for rotating the first tubular conduit.

Preferably, the third tubular conduit is provided with an inlet duet provided with a passage for funneling material gravity fed from an aligned bin into the second annular passageway, and an outlet duct communicating with the opposite end of the second tubular passageway into which material received through the inlet end thereof is be conveyed and discharged into the outlet duct, guiding such material into a conveyer duct, a receptacle or a bin. Material gravity fed into one end of the second annular passage and conveyed therethrough to the other end thereof by rotation of the first tubular member provided with the helical member, is prevented from accumulating and settling in the spacing between helical flights by air under pressure injected into and through the axial passageway of the first tubular conduit, one or more radial passageways in such first tubular conduit into the first annular passageway and through the interstices of the second annular conduit into the spaces between helical flights, precluding material from settling and accumulating therein. Such air further would function to fluidizing the conveyed material, facilitating its flow.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an apparatus embodying the present invention;

FIG. 2 is a side elevational view of the apparatus showing in FIG. 1;

FIG. 3 is a top plan view of the apparatus shown in FIG. 1;

FIG. 4 is an enlarged, side view of the auger shaft provided in the apparatus shown in FIGS. 1, 2 and 3, having an intermediate portion thereof broken away;

FIG. 5 is a partial view of an end of the auger shaft shown in FIG. 4, illustrating a portion thereof in vertical cross-section;

FIG. 6 is a partial view of an opposite end of the auger shown in FIG. 4, illustrating a portion thereof in vertical cross-section;

FIG. 7 is a partial view of the portion of the auger shall indicated in FIG. 5; and

FIG. 8 is a partial view of the portion of the auger shaft indicated in FIG. 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION

Referring to the drawings, there is illustrated an embodiment of the invention, generally including an assembly 10 for conveying a fine bulk material gravity fed from a vessel 11 and discharged into a conduit 12. Assembly 10 includes an inner, tubular conduit 13 formed of an impermeable material, an intermediate tubular conduit 14 formed of a permeable material encompassing, spaced from and disposed coaxially relative to inner conduit 13 and an outer tubular conduit 15 also formed of an impermeable material encompassing, spaced from and also disposed axially relative to inner conduit 13.

Inner tubular conduit 13 includes an axially disposed fluid passageway 16, having one end as shown in FIG. 5 extending through an opening in a side of conduit 12 and journalled in a mounting provided on an opposite side of conduit 12, and an opposite end as shown in FIG. 6, provided with a stub shaft portion 18 having one end thereof extending into and closing an end of passageway 16 and an opposite end extending into and journalled in the housing of a gear reduction unit 19, connected to the gear train of such unit, driven by a motor 20 mounted in the housing of the gear unit which could also be driven by a belt or roller chain drive.

As best shown in FIGS. 5 through 8, intermediate tubular conduit 14 cooperates with inner tubular conduit 13 to provide an annular passageway 21 closed at opposite ends by annular sealing components 22 and 23, as best shown in FIGS. 7 and 8. Intercommunicating passageways 16 and 21 is one or more radially disposed passageways 24 as best shown in FIG. 7. Conduit 14 may be formed of a material sold by The Young Industries, Inc. of Muncy, Pa. under the trademark TRANSFLOW. Disposed on and secured to conduit 14 is a helical member 25 cooperating with inner and intermediate conduits 13 and 14 to provide an auger shaft functional to convey bulk particulate material within the flights thereof.

Outer tubular conduit 15 cooperates with intermediate tubular conduit 14 to provide an annular passageway including helical member 25, preferably spaced from conduit 15. As best shown in FIGS. 1 through 3, one end of conduit 15 is secured to a side of conduit 12 with the passageway between conduit 13 and 14 communicating with the interior of conduit 12 and an end of helical member 25 extending into the interior of conduit 12, and the other end thereof is closed with a flange secured to and supported on a matching flange of the housing of unit 19.

Mounted on one end of conduit 15, adjacent unit 19 and spaced from conduit 12 is a duct 26 which communicates with the passageway between the intermediate and outer conduits 14 and 15 through an aligned opening in conduit 15, as shown in FIG. 3, for gravity feeding a bulk particulate material into the annular passageway between the intermediate and outer conduits 14 and 15, to be conveyed by helical member 25 to and discharged into conduit 12. The upper end of funnel component 26 is provided with an annular flange 27 to which a compatible flange 28 of an elevated bin provided with a frusto-conically configuration section may be attached for gravity feeding material to be conveyed into outer conduit 15.

Supported on assembly 10 is a pressurized air line 30 connected at one end to outer conduit 15 and communicating with axial passageway 16 in conduit 13 as at 31, connected at a first intermediate location to outer conduit 15 and communicating with the annular passageway between conduits 14 and 15 as at 32, communicating with the lower end of duct 26 as at 33 and connectable to a source of air under pressure by means of a connection end 34.

In the operation of the assembly as described to convey bulk particulate material gravity fed from vessel 11 into conduit 12, motor 20 is operated to rotate inner conduit 13 and intermediate conduit 14 with helical member 25, and air under pressure is supplied to air line 30. As the helical member is rotated, material fed through duct 26 into outer conduit 15 will be caused to be conveyed by helical member 25 and discharged into conduit 12. As air under pressure is applied to air line 30, such air will flow through, axial passageway 16, radial passageways 24, annular passageway 21, through the interstices of intermediate conduit 14 and into the annular passageway between conduits 14 and 15, providing a fluidizing layer of air between flights of helical member 25. Such fluidizing layer of air between flights of helical member 25 functions to prevent the settlement and accumulation of material being conveyed thus providing a continuous and even flow of material being conveyed.

The continuous and even flow of material further is enhanced by injecting air under pressure through connector conduit 33 into duct 26, fluidizing the material gravity fed into conduit 15, thus enhancing an even flow, and by injecting air under pressure through connector conduit 32 into the outer side of conduit 15, further fluidizing the material being conveyed by the helical member.

Any form of material holding and/or conveying device including vessels, bins, conduits and the like may be used to feed material into assembly 10, and any such device may be used to receive material conveyed by such assembly.

From the foregoing detailed description, it will be evident that there are a number of changes, adaptations and modifications of the present invention, which come within the province of those persons having ordinary skill in the art to which the aforementioned invention pertains. However, it is intended that all such variations not departing from the spirit of the invention be considered as within the scope thereof as limited solely by the appended claims. 

1. An apparatus for handling a fine bulk material comprising: a support; a first tubular conduit formed of a gas impermeable material journalled in said support, having a closed end providing an axially disposed passageway with at least one radial outlet; a second tubular conduit formed of a gas permeable material, encompassing and spaced from said first tubular conduit, having closed ends, providing a first annular passageway communicating with said radial passageway in said first tubular conduit; a helical member mounted on said second tubular conduit: a third tubular conduit formed of a gas impermeable material mounted fixedly on said support, having an inlet adjacent an end thereof, encompassing and spaced from said second tubular conduit, providing a second annular passageway including said annular member, closed at one end, opened at a spaced outlet end and communicating with said inlet of said third tubular conduit, adjacent said closed end thereof; means for injecting a fluid under pressure into said first passageway and through said radial passageway, said first annular passageway and said permeable tubular conduit, sufficient in precluding the settling of said material in said second annular passageway, between flights of said helical member; and means for rotating said first tubular conduit.
 2. The assembly according to claim 1 wherein said support includes a receptacle.
 3. The assembly according to claim 2 wherein said first conduit includes an end which extends through an opening in said receptacle and is journalled at one end thereof in a wall component of said receptacle.
 4. The assembly according to claim 2 wherein an end of said second conduit and an end portion of said helical member extend through an opening of said receptacle into the interim thereof.
 5. The assembly according to claim 2 wherein an end of said third conduit is supported on said receptacle.
 6. The assembly according to claim 2 wherein said receptacle comprises a means for holding and/or conveying a bulk particulate material.
 7. The assembly according to claim 1 wherein said first conduit includes an end which is journalled in a housing of said means for rotating said first tubular conduit.
 8. The assembly according to claim 1 wherein said third conduit includes an end wall closing said third annular passageway, connected to a housing of said means for rotating said first tubular member.
 9. The assembly according to claim 1 including means disposed on said third tubular conduit for funneling material through said inlet thereof into said second annular passageway.
 10. The assembly according to claim 1 including means for feeding a bulk particulate material into said inlet of said third tubular conduit.
 11. The assembly according to claim 10 wherein said feeding means comprises a means for holding and/or conveying a bulk particulate material.
 12. The assembly according to claim 1 wherein said fluid injecting means includes means for injecting a fluid under pressure into said second annular passageway through an opening in said third tubular conduit.
 13. The assembly according to claim 1 wherein said means for rotating said first tubular member includes a gear reduction unit supported on said third tubular member and operatively connected to said first tubular member, and a motor mounted on said gear reduction unit and operatively connected thereto. 